I've owned a MTD 46" cut w/16HP engine for almost 20 years. It's been a good work horse cutting my 1 acre of Texas hill country land. It's very rocky/rough. It's tired, and I'm getting old. It requires a LOT of effort to steer. I'm looking to replace it with something that will make mowing not as hard on my old body. Recommendations? I'd like something that will last me another 20... Mandatory BITOG content: I've been changing the oil/filter over the years regularly and the oil is still clean looking!